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Goodwill
6 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill
  
As of March 31, 2018, goodwill consists of the following (in thousands):
 
 
Americas
 
EMEA
 
APAC
 
Total
Goodwill as of September 30, 2017, gross
 
$
773,384

 
$
51,190

 
$
16,955

 
$
841,529

Accumulated impairment
 
(569,201
)
 
—

 
(5,684
)
 
(574,885
)
Goodwill as of September 30, 2017, net
 
204,183

 
51,190

 
11,271

 
266,644

 
 
 
 
 
 
 
 
 
Changes during the period
 
—

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
Goodwill as of March 31, 2018, gross
 
773,384

 
51,190

 
16,955

 
841,529

Accumulated impairment
 
(569,201
)
 
—

 
(5,684
)
 
(574,885
)
Goodwill as of March 31, 2018, net
 
$
204,183

 
$
51,190

 
$
11,271

 
$
266,644